Apparatus for determining the length of waves and observing the oscillations in electric oscillation systems.



-PATENTED JUNE 21, 1904. J. DO'NITZ.

APPARATUS FOE DETERMINING THE LENGTH OF WAVES AND OBSERVING THE OSGILLATIONS IN ELECTRIC OSGILLATION SYSTEMS.

APPLICATION FILED SEPT. 15, 1903. H0 MODEL.

Fig.1.

JOHANNEISEDONITZ, or BERLIN,

iPatented June 21, 1904. v

GERMANY, AssieNoR TO GESELLSCHAFT FUR DRAHTLOSE TELEGRAPHIE, G. M. B.-H., OF BERLIN, GERMANY, A

.' CORPORATION OF PRUSSIA.

APPARATUS FOR DETERMINING THE LENGTH OF WAVES AND OBSERVING THE OSCILLATIONS IN ELECTRIC I OS'CILLATION SYSTEMS- I SPECIFICATION forming part of Letters Patent No. 763,164, dated June 21, 1904. Application filed September 15, 1903. Serial No. 173,297. (No model.)

To all whom it may concern:

Be it known thatl, J OHANNES Donrrz, a citi zen of the Kingdom of'Prussia, residing at Planufer 17, Berlin, Germany, have invented a certain new and useful Improvement in Apparatus for Determining the Length of Waves and Observing the Oscillations in Electric Oscillation Systems, ofwhich the following is a full, clear, and exact description, reference bemg had to the accompanying drawings, forming a part of this specification.

This invention has for its object an apparatus for the direct measurement of the wave lengths of electric oscillations, as well as the examination of the oscillations in electric cscillating systems. The apparatus for this object has a closed oscillation-circuit which is coupled with the system to be examined in the ordinary manner, electromagnetically, electrostatically, or in any other way, so that it swings with the system to be examined. This cooscillation takes place the more vigorously the better the oscillation-circuit corresponds in its electric values (capacity and self-induction) to-the requirements of resonance. Now according to this invention the apparatus is so arranged that one or both of these electric values may he altered immediately within wide limits in a gradual progressive manner, the adjusting arrangement being provided with a reading-oil devicefor the wave lengths corresponding to the actual adjustment as regards resonance and indicating in a currentmeter switched into the circuit of oscillation or inductively connected therewith the current strengths arising in the circuit. By this connection of the meter with the adjusting device, which is provided with a directindicatihg-scale, it is possible to. make the aforesaid observatlons m a slmple and rapid manner, as

will be hereinafter explained.-

. A preferable form of construction of the apparatus, which is characterized by a large measuring; capacity with a convenient con;

struction, results if in addition to the gradual and progressive adjustahility of one electric -valuefor instance, the capacity'the other (in this case the self-induction) he made variable (or adjustable) in definite stages, these stages being so calculated that the gradual alteration of, the first value can lie utilized with- I .denser' c, which will he hereinafter further dsecribed and which has two terminals 2 2 primary windings i ofan induction-coil, and connecting-wires 1 2 3.

The condenser 0 has a series of fixed parallel plates f of semicircular form arranged at uniform distances apart, which are all connected to the terminal 2, and a series of similarlyshapedplates b, rcvoluhle as a whole on a spindle a, which second series is insulated from the first and are all connected with the other terminal 11 When the spindle a is rotated, the series of plates 7) are gradually brought into the interstices between the fixed series of plates f. This rotation is effected by means of a knurled disk or hand-wheel g. The electrostatic elfective surface or the condenser,.and thus the capacity of the oscilla tion-circuit, varies in value according to the adjustment of the plates. The secondary coil 2" of the induction-coil forms with a heatwire current-meter h an independent circuit, the current proportions of which, on account of its inductive coupling with the oscillationcircuit hereinhefore mentioned, are similar to those of the latter and allow of a direct connection of its circuit with the latter. The action'of the current-meter is based on an arrangement by which the heat produced by the current traversing the resistance w of said cillation-circuit.

-nected with the handle g of thecondenser and when the latter is rotated travels over a oscillationrcircult seen,

for half a value, and with s for double the the U-tube, so :that the differences in lev'elof the liquid resulting therefrom gives indications as to the strength of the current flowing through the resistance w, and thus also of the strength of current ruling in the actual os-.

An indicator .2 is firmly conscal t. The latter is divided in wave lengths in such a way that 'the indicator each time indicates the length of the waves arising in the which corresponds to the actual value of the capacity and the unaltered value ofthe self-induction. Of course the scale instead of being divided according to the wave lengths may be divided according to number of oscillations. The self-induction coil 8 is connectedwith the attachment-terminals k by means of an easily-releasable plug-contact and is capable of beingchanged for other coils s s (shown in Figs. 3' and 4,) appended to the apparatus. The respective self-induction of these three coils is so calculated that with a suitable change of p'lugs (coils) the selfinduction of the' oscillation circuit is altered in the following proportion -s s s :1z4. As these values with their square-root equivalents have anginfluence on the wave lengths, each graduationof the scale, as will be easily counts with s fora single value, with 8 value of a certain wave length,and as the scale with the coil 8 has ameasuring capacity of L equals. two hundred and eighty to five hundred and sixty when the plug ischangedto s it will be reduced until L equals one hundred and forty and when the plug is changed to s it will be enlarged until L equals eleven hundred and twenty. These separate measurement values areconnected with one another by this grading of the self-induction, so that the apparatus as a whole covers a measurement capacity of from Lequals one hundred and forty to eleven hundred and twenty. g

The measurements are taken in the following manner: The length of the waves is ascertained by the capacity, and, if necessary, the self-indutiombeing' changed until the current-meter indicates the maximum strength of .current. The electric oscillations in theoscillation-circuit being therefore in resonance with the oscillations to be examined, the position of the indicator on .thescale then directly gives the actual length of waves. The

examination of a given wave-diagram as to whether several waves of'diiferent' lengths are contained therein andas to what kind they are is eflected by observing whether'and at what separate adjustments of theappara 1 tus current maxunaarise with a continued alteration of the electric capacities of the oscillation-circuit, the respective separate wave catolt,

lengths being always indicated on the scale for direct reading off and also the amplitudes of the separate waves ascertained in relative amounts from the proportion of the separate movements of the current-meter. Finally, observation as to whether the movement of liquid in the current-meter diminishes rapidly or slowly if the oscillation-circuit undergoes small displacements toward either side from the resonance position enables a sure conclusion to be drawn as to the respective wave.

Having now particularly described and asu certained thenature ofmy said invention and in What manner the same is to be performed, I declare that/what I claim is 1. An electrical measuring instrument, consisting of a closed resonator calibrated to wave length, substantially as described.

2. An electrical measuring instrument, consisting of a closed resonator calibrated to wave length in connection with a current-indicator, indicating the oscillations in the resonator, substantially as described.

3. An electrical measuring instrument, consisting of a closed resonator; means for changingthe natural period-of the circuit and means for indicating the resultant wave length, sub.

stantially as described.

4. An electrical measuring instrument, consisting of a closed resonator including adjustable elements determining the period or frequency of the oscillations, substantially as described.

5.' An electrical measuring instrument, consisting of a closed resonator including ad3ustable elements determinin the period or frequency of the oscillations, in connection with a current-indicator which indicates the resonance of the resonator with any-adjacent oscillation-circuit', the wave length or period of,

which is to be measured, substantially as described.

6. An electrical measuring instrument, consisting of a closed resonator including acondenser, the capacity of which may be slowly changed, in connection with a current-indiindicating the occurrence of electrical oscillations in the resonator, descrlbe'd. I

-Z. An electrical measuring instrument, consubstantially as sisting of a closed resonator including a self-- induction coil which may be interchanged with coils of greater or smaller self-induction, substantially as described.

the sharpness of v8.. An electricalmeasurlng instrument, consisting of a closedresonator including a condenser, the capacity of which is slowly changeable andaself-induction coilwhich may be interchanged withcoils of greater-or smallerself-induction, means for adjusting the 'capacity of the'eondenser, and means for indicating substantially as described.

as to-wave length the result of the adjustment,

sisti'ng of a 'closed resonat or including a condenser, the capacity of which is slowl changeable and a self-induction coil which may be interchanged with coils of greater or smaller self-induction, means for adjusting the capacity of the condenser, and means for indicating as to wave length. the result of the adjustment, in connection with a heat-wire current-meter which indicates the occurrence of electrical 0scillations in the resonatohsubstantially as described." v 10. An electrical measuring instrument for determining the length of Waves in systems for space telegraphy, consisting of a closed reson ator includingqadjustable'elements determining the frequency of the oscillations in the reso- .nator, in combination with a current-meter.

which indicates the occurrence ofelectrical oscillations in the resonator, one part ofthe latter being inductively or conductiv'ely coupled with the oscillating-system to be tested, substantially as described. v y

In witnesswh ereof I hereunto subscribe my CHAS. L. COLE, PAUL ARRAs. 

